An Australian scientist has discovered a strange species of frog in southern Vietnam.

The vampire flying frog uses its webbed toes to glide between treetops. But it earned its nickname because the frogs' tadpoles have odd black fangs.

Australian Museum scientist Dr Jodi Rowley, who found the frog, says it is the first time fangs have been discovered in a tadpole. "We don't know of anything quite like this that's for certain, so we're taking a lot of time to work out why on Earth they have these fangs," Dr Rowley said.

"Maybe it's got something to do with what they consume.

"They breed in very minute pools of water that are found in the holes in the trunks of trees, so maybe they eat something mainly strange up there."